Percussive-tool



H. V. HAIGHT.

PERCUSSIVE TOOL.-

APPLICATION FILED DEC. 11, 1913.

PatentedSept. 20, 1921.

11v mm v aspecification.

1 drill in section;

BDI TA SL EN v OFFICE.

HARRY V. HAIGHT, OF SHERBBOOKE, QUEBEC, CANADA, ASSIGNOR TO INGERSOLL-RAND'QOMPANY, JERSEY CITY, NEW JERSEY, A CORPORATIONOF'N JERSEY.

rmwossrvnroon Specification Letters Patent. Patented Sept. 20, 1921.

Application med December 17,1918, Serial no. 2 7,1.

T 0 aZZ whom it may concern:

Be it known that I, HARRY V. .HA'IGHT, a subject of the King of GreatBritain, residing at Sherbrooke, in the Province of Quebec, Dominion ofCanada, have invented a certain new and useful Improvement inPercussive-Tools, of which the following is This invention relates topercussive tools and in particular to, a fluidoperated percussive orhammer drill admitting a part of the actuating fluid and also acleansing fluid downthe drill steel'to free the drill bit; fromcuttings. v

The objects of the present invention are to provide a mechanism forcontrolling the admission of cleansing fluid as'well as a part of theactuating fluid to the drill steel from thetool to force the cuttingsawayfroIn-the cutting edges of the drill steel to provide mechanismwholly contained within the drill for accomplishing thisfunction', themechanism being operatively controlled by movement of a single means.

With the above and other objects in viewmy invention consists in thefeatures of con struction and operation set forth in the followingspecification and illustrated in the accompanying drawings, forming apart hereof, in which Figure 1 shows a longitudinal view of the Fig. 2,a partial longitudinal view taken through another section;

Fig. 3, a sectionalview of a fica'tion, and

Fig. .4. is .a transverse sectional view on line l-Ll of Fig. 1 lookingin'the direction of the arrows- Referring more particularly to thedrawings 1 refers to the cylinder having attached at its forward end afront'head 2 within which is contained an anvil block 3. A chuck 4.- isprovided fitted against the forward end of front head 2 within which iscontained the drill steel 5. At the rear end of the cylinder 1 isprovidexi a back head 6 within which is contained the throttle valve 7controlling the supply ofmotive and cleansing fluid. In rear of the backhead 6 is the feed cylinder, 8 of the usual form found in stopperssupplied with fluid through a conduit 9 extending from the throttle 7.As is usual in this type of tool the front head, cylinder, back head,and feed cylinder are held slight m nprgidly together by side bolts, notshown.

ithin the cylinder 1 operates a piston or hammer 10 at the forward endof its stroke striking the anvil block 3. The piston is of the usualform so will not be further described. Extending forwardly from thethrottle valve 7 through thecylinder 1 is a passage 11 joining acontinuingpassage 12 within thefront; head terminating in connectedgrooves 13pr0vided in the annular inside surface of the front head 2.The function of the grooves 13 is to form an air seal around the anvilblockto preventv the passage of the water in .either direction from thwater groove 21, and the motive fluid pressure maintained inthe sealinggrooves 13 should be greater than the pressure of thewater in the watergroove 21. vThe passage 11 .at its rear end joins the throttle I valve 7in a position to intercept passagel f and radial opening 15 providedwithin the throttle valve 7 which are directly in communication with thesourceof fluid supply. Another passage 16 extends longitudinally of thecylinder lintercepting-a short. passage 17 within the back head 6'whichintercepts a portion of the throttle valve 7 in which is containedanopening 18 in communication, when in its open position, with a Waterconnection 19. The forward end of the passage 16. joinsa passage 20through,

the front head 3 terminating in the annular" groove 21 so that a.continuous passage is provided within the tool forwater to be admittedto the anvil block. The anvil block" 3 is provided with passages 22. and23 intercepting respectively the air and water passages '12 and 20provided withinthe front head which intercept each other and extend tothe front end of the anvil'block in a single passage'24. Thepassage'24'is central ofthe anvil block 3 and is directly in alinementwith the central hole provided within the drill steel 5. Inthmodification shown in Fig. 3 the motive fluid supplied to the anvilblock to force the cleansing fluid down the drill steel is takendirectly from the front end of the cylinder 1 through a passage 25. Thispassage 25 is in communication with two annular grooves 26 which are inevery way similar to the grooves 13 shown in Fig. 1. From the rearwardgroove 26 the fluid passes through passages 27 and '28 to the passage 29in which the motive fluid and cleansing fluid commingle and pass intothe drill steel 5. The water nipple in this modification is attached atone side of the front head 2 as shown at 30, communicating with thepassage 29 by means of a groove 31 provided in the front head andpassage 32 pro vided in the anvil block.

From the above description it will be seen that a construction has beenprovided permitting cleansing fluidto be admitted to th anvil block ofthe drill and .from there into the drill steel from a source of supplycontrolled by a valve preferably located at the rear end of the drill;but as shown in Fig. 3 the-source of supply may be located near thefront head of the tool. Also, a passage. is provided for fluid underpres-.

sure to be admitted to the anvil block, to aid the forcing of cleansingfluid down the drill steel. Both ofthese passages are con-.

trolled by but one throttle handle in the preferred construction,movement of which first opens the passage 11 to admit motive fluid tothe anvil block, after which continued movement of the throttle servesto open passage 16 to admit the cleansing fluid. It is to be understoodthat the present showing and description disclose only certain specificembodiments of my present invention, and that other forms and m.odi-.

fications are included within the spirit and scope of the invention, asexpressed in the appended claims.

What I claim is:

1. In a percussive tool, a front head construction'comprising a fronthead, an anvil block slidably mounted therein, a water conduit leadingthrough the side of the front head and'the side of the. anvil block'to aEointintermediate the length of said anvil lock in a central passageextending to theforward end of the anvil block, for conductsaid anvilblock intermediate of its length,

' a passage through the side of the anvil block for connecting the saidwater groove with a central passage extending to the forward end of theanvil block for conducting water.

to a hollow drill steel, a water conduit leading through the side of thefront head to said water groove, one of said members having annularsealing grooves. at each side ing motive fluid under pressure to saidsealing grooves to prevent water from passlng in either direction fromsaid water groove between the anvil block and the front head.

3. In a percussive tool, a front head con- I struction, comprising afront head, an anvil block slidably mounted therein, an annular groovesurroundlng said anvil block 1nterof said water groove, and means forsupplymediate of its length a passage through the side of the anvilblock for connecting the said water groove, with a centralpassageextending to the forward end ofthe anvil block for conducting water to ahollow drill steel, a water conduit leading through the side of thefront head to saidwaterigroove, annular seahng grooves in said anvilblock 'ateach side. of said water groove, and means for supplyingmotivefluid under pressure.

to said sealing grooves to preventwater from passingin either directionfrom said water groove between the anvil block and the front head.

at. In a percussive tool,a front head con struction, comprising a fronthead, an anvil block slidably mounted therein, an annular groovesurrounding said anvil block intermediate of its length, a passagethrough the 1 side of the anvil block for connecting the said watergroove with a central passage ex;

tending to the forward end of the anvil block for conducting water to ahollow drill steel, a water conduit leading through the side of thefront head to said water groove,

annular sealing grooves in said anvil blockat each side of said watergroove, and means for maintaining motive fluld in. said sealinggroovesiunder higher pressure than the water contained I in the water groove toprevent water from passing in either direction from saidwatergroovebetween the anvil block and front head. y I

In testimony whereof I have hereunto set my hand. I

HARRY v. HAIGHT.

